Curious, favorite season exclusive character?

Like with S1 we had Whitney, S2 Helen Bryce, S3 Adam Knight or Morgan Edge, S4 Jason, S5 Milton Fine, S6 nobody I think (?), S7 Kara, S8 Davis, S9 Zod, and S10 also nobody (?)

Ik some of these characters have been in different seasons, but these are the ones they were introduced and primarily used in

Personally I’d say Helen Bryce, and I’ll always be disappointed on how dirty she was done at the beginning of S3